OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 7 No. 2 2025 The nomenclature of the PVD-coated carbide drill used in this research study was SD1105A-0680-04308R1 with a point angle of 140° and 8 mm diameter. This drill was coated with polished AlCrN coating. The uniqueness of AlCrN coating is that it offers high abrasion resistance, high hardness, good adhesion, and good chip evacuation [27]. A vertical machining center (BMV 60+ series) was selected for the drilling operation, ensuring highly precise and accurate quality performance with high speed and feed rate. Fig. 3, a shows the spike wireless force sensor with tool holder. This wireless force sensor tool holder was used to measure the generated force, torque, and bending moment directly at the tool holder, and the captured data were transmitted to the receiver through a wireless network. The corresponding software processes the data and provides the desired output. As shown in Fig. 3, b, the MQL system used in this experiment has two inlet tubes and one discharge pipe that combine in the mixing chamber. One inlet tube was attached to an air compressor, while the other was inserted into a container containing a newly formulated nano-cutting fluid. Based on the air pressure, the oil from the container was pulled out and supplied through the discharge tubes in the form of mist. For various combinations of process parameters, drilling tests were carried out. The use of Undi oil in metal cutting as a cutting fluid may lead to multiple environmental and agricultural advantages; hence, this oil was selected for experimentation. Undi oil has high survival potential in the environment, remaining stable for up to 50 years. It does not compete with food crops. It serves as a windbreaker at the coast where it can reduce abrasion, protect crops, and offer ecotourism benefits. It has higher oil yield, viscosity, and flash point than generally used non-edible vegetable oils such as Jatropha, Neem, Rubber, a b c Fig. 1. SEM micrographs of Al/SiC MMC at SiC volume fractions of: a – 10%; b – 20%; c – 30% a b Fig. 2. Al-SiC MMC workpiece material (a) and AlCrN (PVD) сoated drill (b)
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